Steel 25Х3МФА-

Designation

Name The value
Designation GOST Cyrillic 25Х3МФА-А
Designation GOST Latin 25X3MFA-A
Transliteration 25H3MFA-A
By chemical elements 25Cr3MoVN-

Description

Steel 25Х3МФА AND used: for the production of workpieces in the form of forgings, sheets, sheet blanks, the sheet of stamped blanks, Cavanaugh-rolled billets (slabs), used for products of machinery and vessels, working under pressure and within the jurisdiction of the Gosatomenergonadzor.

Standards

Name Code Standards
Blanks. Of the workpiece. Slabs В31 TU 108.131-86

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu As V Mo Sn Sb Co
TU 108.131-86 0.22-0.27 ≤0.015 ≤0.012 0.3-0.6 2.8-3.3 0.17-0.37 ≤0.4 Rest ≤0.1 ≤0.01 0.25-0.35 0.6-0.8 ≤0.005 ≤0.005 ≤0.025
Fe is the basis.
According to TU 108.131-86 the chemical composition is given for steel grade 25X3MFA. In the chemical composition, deviations are allowed: for carbon -0.010%, for manganese, silicon, and vanadium ± 0.050% for each chromium ± 0.10%. In steel, the total content of phosphorus, antimony, and tin should not be more than 0.015%. Additional determination of the content of zinc, lead and bismuth is carried out. The results of the determination are not delivery, but are recorded in the certificate.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
Billet heat-treated in the delivery condition on the other 108.131-86
≤600 ≥430 540-735 ≥14 ≥50 ≥490 187-229
≤600 ≥390 ≥490 ≥14 ≥50 - -
≤600 ≥430 540-735 ≥14 ≥50 ≥490 187-229
≤600 ≥390 ≥490 ≥14 ≥50 - -

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number